MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 1. Introduction
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1-1 Read This First
The MicroVersaTrip Plus™ and MicroVersaTrip
PM™ Trip Units described in this publication are
used on Power Break® and Power Break® II
insulated-case circuit breakers, Type AKR low-voltage
power circuit breakers, R-Frame molded-case circuit
breakers, and low-voltage power circuit breaker
conversion kits.
Spectra RMS™ molded-case circuit breakers use
different versions of MicroVersaTrip Plus and
MicroVersaTrip PM Trip Units that are not
interchangeable with the units described here. Refer
to GEH-5934 for information on these Trip Units.
1-2 Product Structure
MicroVersaTrip Trip Units come in two different
sizes that are not interchangeable. The larger Trip
Unit (series RMS9C) is used on Power Break circuit
breakers, Type AKR circuit breakers, and conversion
kits. The smaller Trip Unit (series RMS9D) is used
only on Power Break II circuit breakers. Each of the
two sizes is available in both MicroVersaTrip Plus
and MicroVersaTrip PM configurations. The front
views of the MicroVersaTrip PM Trip Units are
shown in Figures 1 (RMS9C) and 2 (RMS9D).
The RMS9C Trip Unit has a 36-pin rear connector,
while the RMS9D Trip Unit has a 50-pin rear con-
nector, as shown in Figures 3 and 4. These connec-
tors provide the Trip Units’ main connections to the
circuit breaker frame and to the equipment control
signals.
Both types of Trip Unit have recessed connectors in
the front panel to accept interchangeable current
rating plugs.
Both types of Trip Unit have a top-mounted 20-pin
connector that provides future access to the optional
Remote Display accessory. (
Note: this accessory is not
normally used with a Power Break II circuit breaker.)
This connector has a removable cover to protect it
when not in use.
Series RMS9D Trip Units also have a 6-position DIP
switch, not present on series RMS9C Trip Units, that
is used to configure the Power Break II integrated
accessories. This switch is located on the rear of the
unit.
Figure 1. Front view of MicroVersaTrip PM Trip Unit (series
RMS9C).
Figure 2. Front view of MicroVersaTrip PM Trip Unit (series
RMS9D).
